Add WinGet source repo support (#87)

* winget-source: init

* winget-source: cleans up temp directory before exit

* winget-source: update package.json

* winget-source: improves Dockerized performance

* winget-source: use modified time instead of MD5

* winget-source: better naming

* winget-source: more robust `getRemoteURL()`

* winget-source: JSDoc-styled documentation

* winget-source: support debug mode

* winget-source: skip update if bundle is unchanged

* winget-source: add description in README

* winget-source: add default upstream URL

* winget-source: fix file permission

* winget-source: style fix

* winget-source: support logging to file

* winget-source: sync newer manifests first

* winget-source: update NPM package name

* winget-source: remove skipped messages from log

* winget-source: simplify setup

* winget-source: support `BIND_ADDRESS`

* winget-source: clarify actually used options

* winget-source: simplify `Dockerfile`

* winget-source: improves Docker image layer cache

* winget-source: style update

Author: stevapple

README.md

@@ -38,6 +38,7 @@
     - [rsync](#rsync)
     - [rubygems](#rubygems)
     - [stackage](#stackage)
+    - [winget-source](#winget-source)
     - [yum-sync](#yum-sync)
   - [License](#license)
   - [Contributing](#contributing)
@@ -413,6 +414,18 @@ Stackage doesn't need to specify upstream, but this mirror use cabal to install
 
 Read the [user guide](https://www.haskell.org/cabal/users-guide/installing-packages.html#repository-specification) before writing preferred mirror to `config`
 
+### winget-source
+
+[![winget-source](https://img.shields.io/docker/image-size/ustcmirror/winget-source/latest)](https://hub.docker.com/r/ustcmirror/winget-source "winget-source")
+[![winget-source](https://img.shields.io/docker/pulls/ustcmirror/winget-source)](https://hub.docker.com/r/ustcmirror/winget-source "winget-source")
+
+A handy tool to sync pre-indexed [Windows Package Manager](https://github.com/microsoft/winget-cli) (aka. WinGet) sources.
+
+| Parameter             | Description                                                      |
+| --------------------- | ---------------------------------------------------------------- |
+| `WINGET_REPO_URL`     | Sets the URL of upstream. Defaults to [`https://cdn.winget.microsoft.com/cache`](https://cdn.winget.microsoft.com/cache) |
+| `WINGET_REPO_JOBS`    | Parallel jobs. Defaults to 8.                                    |
+
 ### yum-sync
 
 [![yum-sync](https://img.shields.io/docker/image-size/ustcmirror/yum-sync/latest)](https://hub.docker.com/r/ustcmirror/yum-sync "yum-sync")

winget-source/Dockerfile

@@ -0,0 +1,12 @@
+FROM ustcmirror/base:alpine
+LABEL maintainer "YR Chen <[email protected]>"
+
+RUN apk add --no-cache nodejs
+
+ADD ["package.json", "package-lock.json", "/"]
+RUN apk add --no-cache npm python3 && \
+    npm ci --prefix / --only=production && \
+    npm cache clean --force && \
+    apk del --purge --no-cache npm python3
+
+ADD ["sync.sh", "sync-repo.js", "utilities.js", "/"]